Plant I.D help

Hello everyone, new member here. I am in college and I manage a few farms my grandad owns near the Miss. river in Tennessee. I have been engaged in moist soil management for many years without really knowing it. It's not too hard to open some boards/cut beaver dams, and let nature take its course. I have just now began to read on it and realize different drawdowns and different times of the year depict what grows. Well this year I did a late drawdown and I have about 10 acres of this stuff growing.. it's only about 30-40 days in so it might be too young to tell.. can anyone help me I.D. This plant?

Redroot flatsedge is common after late (July/August) drawdowns and some of your pictures look like they could be redroot flatsedge, but I am far from a sedge expert. Redroot flatsedge is a good waterfowl food.

The first pic sure looks like millet to me…….or at least the majority of it does (barnyard grass some refer to it as I believe). That looks identical to our wild millet in its earlier stages. I would guess it will head out within the next 10 days and then you will know. The other stuff with the spindly tentacles I have no idea.

Thanks for your replies. I've done some research and I'd definitely say it's yellow nutsedge in a young stage. The head hasn't bloomed out like most pictures on the web. All the pictures I posted are of the same plant. Even the green grass in the background is all the same as what I'm holding in my hand. I know what barnyard grass/millet is. It's not the same as this